Rotary pump



March 6, 1928. 1,661,468

J. coRBETT ROTARY PUMP Filed Jan. 27. 1927 2 Sheets-Sheet l l Si [Il IV Ihnen l'.

March 6, 1928.

J. coRBETT A ROTARY PUMP Filed Jan. 27. 1927 2 Sheets-Sheet 2 Ivve for Patented Mar. 6, V1928.

UNITED STATI-:sN

1,661,468 NTfxorrifcr.Li

PATE JAMES OOEBETT, or`V TOEONTO, ONTARIO, CANADA, AssiGNOE or ONE-HALE To BENJAMIN COHEN, or TORONTO, CANADA.

ROTARY PUMP.

Application filed January 27, 1927, Serial No. 164,107, and in Canada January 28, 1926.`

The invention relates to improvements in rot-ary pumps as described in the present specification and shown in the accompanying drawings which form part of the same.

The invention appertains in particular to Vthe type of rotary pump in which an offset rotor revolves at a tangent to the casing and vanes or pistons sweep the crescentshaped chamber formed bythe eccentricity of the rotor. The salient object `of the pres` ent invention is to provide an improved mounting for vanes, one which reduces wear to a minimum and materially prolongs the life of thevane-carrying mechanism.

A general objectl of the invention is to produce an eHicient and durable rotary pump which will withstand hard usage and give good service. 1

With these objects in view the invention consists in the novel construction and arrangement of parts asv described in the'speciication, shown in the accompanying drawings and claimed in the claims hereunto appended.

Referring to the drawings, Figure 1 is a vertical sectional elevation of a rotary pump embodying the present invention.

Figure 2 is a .front elevation with the cover plate removed in order to depict the mechanism therebehind.k

Figures 3 and 3A illustrate a slight modification of the invention, which consists of a renewable slide block mounting for the vaines.

Iii the drawings, the reference numeral 1 indicates generally the stationary casing, which is preferably a casting having one side closed and the other open, the open side being flanged to receive the usual cover plate 2. The casing has the ordinary inlet and outlet openings 18.

The rotor 3, of hollow cylindrical shape, is diametrically smaller than the casing bore and tangentially positioned therein as customary. It has a central 'boss 13, through kwhich the shaft 12 passes and is keyed to secure a driving connection. The shaft is 'ournalled on one side of the rotor by a bearing integral with the casing, while on the other lside it has a journal 14 supported in a bearing 11 integral with the removable plate 2. The shaft` projects from the casing for the purpose of being connected to some form of motive power.

The bearing 11 includes a boss constructed integrally with the inner side of the cover plate 2, which boss extends intothe rotor and is machined eccentrically to the rotor axis but concentrically with respect to the casing bore, thus constituting an eccentric .7 for the purpose of'controlling oi' guiding the varies.

Slidably projecting through the periphery of the rotor is a pair of diametrically opposite vanes 4 and 5, which are retained by a ring 6 fastened to the flange 15 of said rotor adjacent to and preferably bearing against the inner face of thel recess 17 of the cover plate 2. These vanes are joined to each other by means of ribs 8, spaced apart as shown in Figure 1. The inner ends of the vanes are provided with a pair of opposing sliding blocks 9, 9, which have flat faces slidably engaging non-opposed flat bearings of a rotary block 10y that isa running'fit on the eccentric 7. The slots iii the rotor in which the varies operate are flanged as at 15 'in order to increase the bearing area.

With a view to increasing suction and discharge, the vanes 4 and 5 are equipped with feather blades 29.

In the operation of this pump, it will readily be seen that upon motion being imparted to the rotor 3 it carries the varies 4 and 5 around with it. Due to the fact that the vanes are mounted as a unit upon the eccen-l tric, whose true centre is odset with respect to the rotork axis, the varies have a lateral sliding action on the centre block 10. This lateral movement is equal to the centre-tocentre distance of the rotor and casing bore. The large bearing surface between the blocks 9 and the centre block 10 provides a very eflicient mounting for the varies, which re-KV sists wear and prolongs the life of this mechanism.

In the modified forni of the invention shown in Figures 3` and 3A the integral sliding blocks 9, 9 are replaced by removable sliding blocks 23 in order that when worn same may easily be renewed. This renewa rotor. a. stationary eccentric, a plurality of vanes for passing through the periphery of the rotor, a member rigidly carrying the vanes as a unit, Said melnber being provided with opposed tlat. bearing surfaces, and means revolvably engaging the eccentric to present non-opposed tlat faces for sliding engagement with the bearing surfaces of thel said vane carrying n'lember.

2. In a rotary pump of the class described, a rotor. a stationary eccentric, a plurality of ranes for passing through the periphery of the rotor, means connecting the vanes as a rigid unit. sliding blocks carried by said means and provided with opposed fiat; bearing surfaces, and means revolvably engaging the eccentric to present non-opposed tlat. laces for sliding engagement with the bearing surfaces ot the sliding blocks.

3. In a rotary pump of the class described, a rotor, a stationary eccentric` a plurality ot vanes :tor passing through the periphery ot the rotor, a member rigidly carrying the vanes as a unit. said member being provided with opposed flat bearing surfaces, and a rotary block revolvably engaging the eccentric and presenting non-opposed flat taceg tor sliding eugagen'lent with the bearing snrfaces ot said vane carrying member.

4. In a rotary pump ol the class described. a rotor. a stationary eccentric'` a plurality ot vanes for passing through the periphery of the rotor, means connecting the vanes as u.

rigid unit, renewable .sliding blocks carried by said means and provided with opposed ttat bearing surfaces. and means rcvolvably engaging the eccentric to present non-opposed tlat faces for sliding cngagemci'lt with the bearing surfaces ot the .sliding blocks.

In a rotary pump of the class described, a rotor:v a stationary eccentric, a plurality oi vancs for passing through the periphery of the rotor, means connecting the vanes as a rigid unit, sliding blocks. means ren'iovably attachingr said blocks to the vane carrying means, and means revol 'ably engaging the eccentric to present tlat t'aces for sliding engagement. with the sliding blocks.

(i. In a rotary pump of the class described, a motor, a stationary eccentric. a plurality ot vanes for passing through the periphery ot the rotor, ribs connecting said vanes one to the other as a unit, a pair of spaced bosses disposed on each side. of the eccentric and carried by the said vane unit. a .sliding block placed between each pair ot' bosses, a pin passing through each sliding block and the correspomling bosses, and a rotary block revolrably engaging the eccentric and presenting' tlat t'aces for sliding engagement with the sliding blocks.

Signed at the city ot Toronto in the county of York, and Province ot Ontario, this 1st day ot September, 1926.

JAMES CORBITT.

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